let str: string = "str";

let num: number = 1;

let isTs: boolean = true;

let und: void = undefined;

let nul: null = null;

let sym: symbol = Symbol();

let arr: Array<number> = [1, 2, 3];

let arr1: number[] = [1, 2, 3];

let arr2: [number, string] = [1, "2"];
